self Maths Puzzle

We should have 100 number of coins as well as it should be for a total of rs.100 and all should be coins and there should not be any 1 rupee coin

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self Other Question

A circular dartboard of radius 1 foot is at a distance of 20 feet from you. You throw a dart at it and it hits the dartboard at some point Q in the circle. What is the probability that Q is closer to the center of the circle than the periphery?
a) 0.75
b) 1
c) 0.25
d) 0.5
Instead of multiplying a number by 7, the number is divided by 7. What is the percentage of error
obtained ?